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arXiv 1503.02688cond-mat.quant-gas
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调制磁场诱导超冷原子的共振相互作用

Inducing Resonant Interactions in Ultracold Atoms with a Modulated Magnetic Field

D. Hudson Smith

摘要:

在超冷原子系统中,两两相互作用可以通过一种不依赖于磁费什巴赫共振的新机制共振增强。在这种机制中,通过将磁场的振荡平行分量的频率调谐到接近散射原子与两原子束缚态之间的跃迁频率来控制相互作用。当振荡频率接近跃迁频率时,所得s波散射长度的实部$a$共振增强。谐振参数可以通过改变振荡场的振幅来控制。振幅还控制$a$的虚部,其产生是因为振荡场将原子对转化为分子。可以使$a$的实部远大于背景散射长度,而不会从虚部引入灾难性的原子损失。对于散射通道中的浅束缚态,无量纲共振参数是无量纲振幅的普适函数。

英文摘要:

In systems of ultracold atoms, pairwise interactions can be resonantly enhanced by a new mechanism which does not rely upon a magnetic Feshbach resonance. In this mechanism, interactions are controlled by tuning the frequency of an oscillating parallel component of the magnetic field close to the transition frequency between the scattering atoms and a two-atom bound state. The real part of the resulting s-wave scattering length $a$ is resonantly enhanced when the oscillation frequency is close to the transition frequency. The resonance parameters can be controlled by varying the amplitude of the oscillating field. The amplitude also controls the imaginary part of $a$ which arises because the oscillating field converts atom pairs into molecules. The real part of $a$ can be made much larger than the background scattering length without introducing catastrophic atom losses from the imaginary part. For the case of a shallow bound state in the scattering channel, the dimensionless resonance parameters are universal functions of the dimensionless oscillation amplitude.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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